I am no expert in Keil (and am a known C-hater :-) ) so would please the Keil gurus correct me if I am wrong.

If you don't specify explicitly when defining a variable, where to put it in, the compiler decides based on the model used.

You can always override this "default" placement of variables by using the "data", "idata" etc. keywords when defining a variable.

So, you can try to use the small model plus declare some of the variables explicitly as idata.

JW